I have 1994 prostar EFI Indmar and I have taken it to the dealer and they replaced the MAP-EFI sensor and it ran fine. The next year I replaced the MAP sensor again and I know the fuel pump is fine as I relaced that as well.

This year the same problem is happening again as the boat cuts out at the high end at about 3000 RPM

So I can replace the MAP sensor AGAIN, but I think there is a root cause? Any ideas?

No barfooting, What a bummer !

nmcjr

06-05-2011, 02:43 PM

That's an intersting one. I'd say first thing would be to put a fuel pressure gauge on it to see what is happening at 3000 RPM. Sounds a lot like a fuel delivery problem, maybe the regulator, so it would be nice at the very least least to rule out the fuel delivery.